Another reader let us know about their browser RPG as well:
Immortal Empire is a browser-based multiplayer RPG that can be played solo, co-op, or PvP. You control up to 5 unique characters out of an ever-growing pool of character classes in this online strategy game. Equip each of your characters with items found in your travels through four unique environments. Use spells, tactics, and skill to defeat your foes as you unravel the story of the mysterious Empire.
Immortal Empire requires no download or install. And, it’s less than $10 to unlock the entire game and its characters.